Electrically conductive cover sheath for dielectric record discs

Details Electrically conductive cover sheath for dielectric record discs Electrically conductive cover sheath for dielectric record discs

1978-05-30

1980-12-09

Dixson, Jr., William T.

Special receptacle or package

For holding a machine readable recording medium

For holding a grooved phonograph disc

206328, 206444, 361212, H05F 300, B65D 8530

Patent

active

042380308

ABSTRACT:
In order to distribute electric charges that build up on the surface of record discs and also to drain them away, a cover sheath is provided for storage of the record disc having at least its surface in contact with the surface of the inserted record disc made of conducting material. The cover sheath can be made of metallized paper or metallized synthetic resin film on the same kind of machinery as is used for making conventional sound record dust covers of paper of synthetic film. If the material is metallized on only one side, it is provided with a cuff around its opening so as to lead charges to the outside where they can be drained away by a conducting storage structure. If the material is metallized on both sides, instead of providing a cuff, electrical connection of the two metallized layers should be provided. Normal handling of sound records kept in non-conducting cover sheaths produces electric charges providing a field strength of the order of 100,000 V/m at 5 am from the record disc surface, which explains the generation of crackling noises when the record is played. The charges can be reduced greatly by insertion in a metallized cover sheath and still more if the cover sheath is grounded, even through a poor conductor, during normal storage.

REFERENCES:
patent: 3275158 (1966-09-01), Glass et al.
patent: 3422952 (1969-01-01), George
patent: 3784957 (1974-01-01), Bailey
patent: 3941245 (1976-03-01), Oliverius
patent: 4037267 (1977-07-01), Kisor
patent: 4038693 (1977-07-01), Huffine et al.

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